Cryoquip Ambient Air Vaporizer 100 GPM / 20,000 SCFH

How do I size this vaporizer for my flow rate and duty cycle?

This unit is rated for 100 GPM liquid flow. Ambient air vaporizers are typically sized with derating from nameplate on continuous duty to allow for frost buildup cycling and low-ambient conditions; actual delivered capacity depends on inlet pressure, ambient temperature, and whether your operation allows time for defrost cycles. For continuous uninterrupted flow in cold climates, many operators size conservatively or run multiple units in rotation.

What happens to output in cold or humid conditions, and on continuous duty?

Ambient vaporizers extract heat from surrounding air, so capacity drops significantly as ambient temperature falls. High humidity accelerates frost formation on the fins, which insulates the heat exchange surface and further reduces capacity until a defrost cycle clears it. On continuous duty without defrost intervals, expect sustained output well below the rated 100 GPM, particularly in winter or humid coastal conditions.

Can this be put into a different gas service than it previously ran?

This unit was previously operated in LNG service. Changing cryogenic service (e.g., LNG to LIN, LOX, or LAr) generally requires requalification to confirm material compatibility, pressure/temperature suitability, and cleaning to the purity standard of the new gas—oxygen service in particular demands specialized cleaning and materials verification that LNG service does not. The ASME Code Stamp U and National Board Number 3094 provide a basis for requalification, but you'll need the original design documentation and a qualified inspector to confirm suitability for any service other than methane.

What should I inspect on a used ambient vaporizer before buying?

Inspect the finned tubes for mechanical damage, corrosion, or prior frost-jacking distortion, and check all brazed or welded joints for cracks, particularly at tube-to-header connections where thermal cycling concentrates stress. Verify the nameplate, ASME stamp, and National Board Number 3094 are legible and request the original U-1 manufacturer's data report and any operating or hydrostatic test records since commissioning in 2011. The listing notes that inspection availability and additional documentation are to be confirmed, so ask the seller specifically for access to inspect the heat exchange bundle and for copies of the data reports before committing.